# Statistical Method

STATISTICAL METHODS

The topic entails:-

• Defining statistics
• Identifying types and sources of statistical data
• Identifying and describing methods of collecting and recording data.
• Analysis, interpretation and presentation of statistical data using appropriate graphical methods.

• Explaining the advantages of each method of data presentation.

1. Study the table below and answer questions that follow:-

 CROP 1978 1979 1980 1981 1982 COFFEE TEA PYRETHRUM MAIZE 1000 750 300 500 990 700 250 450 870 650 350 550 830 700 400 600 840 600 450 350

(a) (i) Using 1cm to represent 500 tons, draw a compound bar graph to represent the data.

(ii) Give two disadvantages of using the method to represent statistical data.

1. The table below shows leading import crops by value (Kshs. Million). Use is to answer

questions a – c

 CROP Year Un milled wheat Maize Rice Wheat flour 2000 6,989 4,664 1,968 180 2001 7,515 3,342 2,619 639 2002 5,577 229 2,104 237 2003 6,099 1,417 2,981 168 2004 6,754 4,647 3,659 200

(a) (i) Using a scale of 1cm represents 100,000. Draw a comparative bar graph to represent

the data in the table above

(ii) Give three advantages of using comparative bar graphs

(b) Explain three reasons why Kenya is a producer of the commodities shown in the table

above yet she imports the same

1. The table below shows milk production in ‘000 units in selected Districts
 District 1982 1992 2002 Trans nzoia 24 26 40 Kiambu 23 25 31 Meru 25 27 32 Bungoma 12 14 20
1. a) i) Using a vertical scale of 1 centimeter to represent 10,000 units, draw a compound

bar  graph to represent the above-given data

1. Study the figure below and use it to answer question 6. The figure depicts the proportional

divided circles showing the extent of network coverage in Kenya between 2007 and 2009

1. a) i) State four deductions that can be made from the above representation

ii)State three advantages of using proportional circles in representing data

1. The table below shows four principal crops produced in Kenya in the years 2000 and 2001.

CROP             AMOUNT IN METRIC TONS

 YEAR 2000 2001 Wheat Maize Coffee Tea 70,000 200,000 98,000 240,000 13,000 370,000 55,000 295,00

(a) (i) Using a radius of 5 cm, draw a pie chart to represent crop production in the year 2000.

(ii) State two advantages of using pie charts.

(b) Calculate the percentage increase in wheat production between the years 2000 and 2001.

1. Study the data given and use it to draw a pie chart showing mineral production in Kenya;

 Mineral Amount  (000 tonnes) Gold 26 Flouspar 14 Soda ash 32 Zink 28

(a) Using a radius of 5cm, draw a pie chart to represent the above data

(b) List three advantages of using a pie chart in representing data